import pprint

if __name__ == '__main__':
    data = {
        0: ["7", "8", "9", "+", "("],
        1: ["4", "5", "6", "-", ")"],
        2: ["1", "2", "3", "*", "<-"],
        3: ["0", ".", "=", "/", "C"]
    }
    for k,v in data.items():
        pprint.pp(k)
        for k,e in enumerate(v):
            pprint.pp(k)
            pprint.pp(e)

